Which Capsuhelic® gage ports could be connected to the pressure source in liquid service?

Answer

The bottom ports. This allows bleeding of entrapped air from the top ports to eliminate reading error due to compression of entrapped air in the gage. Bleed fittings should be installed in the top ports.

Can the standard Magnehelic® or Capsuhelic® gage be installed outdoors?

Answer

Yes. Front covers are sealed with "O" rings. Capsuhelic vent holes are plugged with foam, and the new high impact acrylic lens material is very resistant to ultra-violet fogging. Additional care is recommended to lead pressure connections downward from the gage and provide as much protection from the elements as possible